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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Read Expiration Dates PDF download Download Article Co-authored by Marrow Private Chefs

Last Updated: October 24, 2025 Fact Checked

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  • Reading “Open Date” Codes
    • |
  • Interpreting “Closed Coding” Dates
    • |
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  • Expert Q&A
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  • Tips
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  • Warnings
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This article was co-authored by Marrow Private Chefs. Marrow Private Chefs are based in Santa Rosa Beach, Florida. It is a chefs’ collective comprised of an ever-growing number of chefs and culinary professionals. Though regionally influenced primarily by coastal, traditional southern, cajun, and creole styles and flavors, the chefs at Marrow have a solid background in all types of cuisine with over 75 years of combined cooking experience. There are 9 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 1,071,659 times.

Lots of food items, beauty products, and medications are thrown away every year because of misunderstood expiration dates. Learn the difference between an open-date code, which gives you a recommendation on how long a certain item will be good for, versus a closed code, which tells you when an item was actually manufactured. By learning to read these different codes, you’ll better understand how long your food will stay fresh, how long the medicine in your cabinet will be potent, and how long your beauty products will be most effective. This will help you be a better consumer, and it’ll ultimately save you money since things won’t be going to waste!

Easy Ways to Read Expiration Dates

First, look for a date with the phrase “use by,” “sell by,” or “best by.” The date will typically be in a “Month/Day/Year” form, so a code like 110324 would mean November 3rd, 2024. Sometimes, letters will be used in place of months, so “A” would be January, “B” would be February, and so on. These are called closed codes, which tell you when a product was manufactured.

Steps

Method 1 Method 1 of 2:

Reading “Open Date” Codes

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  1. Step 1 Look for a date accompanied with “use by,” “sell by,” or “best by. 1 Look for a date accompanied with “use by,” “sell by,” or “best by.”Check the bottom of the product, the sides of the container, the lid, and the necks of bottles. The numbers are stamped on and can sometimes be hard to read or find depending on where they were placed.[1]
    • Many beauty products don’t come with expiration dates, but some do. Keep in mind that most products have a 30-month shelf life. After they have been opened, it’s recommended to use them within 1 year, though if they don’t smell bad or change consistency, you can use your best judgment as to whether or not you want to keep using them.
    • These types of dates that come with a label are “open dates”, meaning that the food or manufacturing company chose that date and it’s meant for the consumer or for the stockers at the store. There are also “closed codes,” but those are meant for manufacturers, rather than consumers.[2]

    Did You Know? Expiration dates for food, medicines, and beauty products aren’t regulated by the USDA or the FDA. They’re added entirely at the discretion of the actual company. This is part of the reason it can be so tricky to read these dates and understand how long your items will actually be good for.

  2. Step 2 Use a “best... 2 Use a “best by” date to determine the peak window of freshness or potency. The best-by date is meant for the consumer. However, it definitely doesn’t indicate that the food item, medication, or beauty product will start going bad after the date given. Rather, it just means that the item will be at its freshest or most effective before that date.[3]
    • If a food item smells bad or if you can see mold or discoloration, throw it out. If it smells good, looks good, and has been properly stored, it should still be safe to eat.[4]
    • If a beauty product smells strange or has changed in consistency, it most likely isn’t good anymore. For example, a lotion might become lumpy or a liquid foundation might become tacky.
    • It’s hard to tell if medicine is no longer potent. Most over-the-counter medications are effective for as long as 10 years past the expiration date. The best recommendation is to ask yourself if you need the medication to work at the full 100%. If so, you may want to replace it if it’s past the expiration date.
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  3. Step 3 Remove products from shelves after the “sell by” date if you’re a retailer. 3 Remove products from shelves after the “sell by” date if you’re a retailer. You can consume food items safely for at least 7-10 days past the sell-by date, but most retailers will be ready to move the stock off of their shelves to make way for new shipments. Medicines and beauty products generally don’t have sell-by dates, unless they contain fresh ingredients.[5]
    • If you’re shopping and notice that a food product is past its sell-by date, you can still buy it. Just keep in mind that it’ll need to be used within a week or so.
  4. Step 4 Read a “use by” date as a tip for when an item might start to go bad. 4 Read a “use by” date as a tip for when an item might start to go bad. This date doesn’t mean that a food item, beauty product, or medicine is no longer safe or that it is bad already. For food items, it means to be on higher alert when you open the product, as it could have started to decay or go stale. For other types of items, it means that the product may not be as effective as it was before the given date.[6]
    • The use-by date has more to do with the item’s quality rather than its safety. Remember, these dates are chosen by the manufacturers, not by the FDA or USDA.
    • Some food products also have a “freeze by” date listed, so that consumers can know when to move their goods from the fridge to the freezer so that they don’t have to throw anything out.
    • Pay attention to odd smells or changed consistencies in food items and beauty products. These indicate that the item may not be good to use or consume anymore.[7]
    • You can safely assume that medicine is still effective if it was bought in the last few years, but go ahead and replace the bottle if you’re concerned about it not working at its full potency, like for pain relievers or allergy pills.
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Method 2 Method 2 of 2:

Interpreting “Closed Coding” Dates

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  1. Step 1 Read a closed code as a “made/manufactured on” date. 1 Read a closed code as a “made/manufactured on” date. On many beauty products and canned goods, you can locate a code that is made of either numbers and letters combined or just numbers. If the code isn’t accompanied by words like “use by,” “sell by,” or “best by,” that means it refers to the date the product was manufactured. There are a few different forms that the closed code may take:[8]

    Tip: Keep in mind that closed-code dating isn’t a representation of a food item’s expiration date. Rather, it’s used for inventory and tracking purposes on the manufacturer’s end.

  2. Step 2 Read letters as though they were assigned to months. 2 Read letters as though they were assigned to months. If the code you’re reading includes a letter, use the letters A through L to figure out if the month is January (A), February, (B), March (C), and so on. Read the numbers after the letter as the date of the month and the year in which the item was produced.[9]
    • For example, if a code reads “D1519,” that means April 15, 2019.
    • Many products might have a closed code as well as an open-date code. If the number you’re reading isn’t accompanied by any words, like “use by” or “best by,” it’s a closed code and doesn’t refer to the food’s quality.
  3. Step 3 Match an all-numerical code with a “month, day, year” sequence. 3 Match an all-numerical code with a “month, day, year” sequence. If the code you’re reading is comprised of 6 digits, it most likely is a month-day-year code. Read these codes as MMDDYY, where “MM” refers to the month, “DD” refers to the date, and “YY” refers to the year. This is one of the more common codes that you’ll see on food items.[10]
    • For example, “121518” would be read as December 15, 2018.
    • Certain brands use a year-month-day sequence, where December 15, 2018, would be written as “181215”.
  4. Step 4 Interpret a 3-digit code as the date in a year that a product was made. 4 Interpret a 3-digit code as the date in a year that a product was made. This is called the Julian calendar code. It’s commonly used on eggs, but also appears on canned goods. Each day of the 365-day year is assigned a numerical value, where “001” is read as January 1 and “365” is read as December 31.[11]
    • For example, if a can of olives shows a 3-digit code of 213, that means it was manufactured on August 1.

    Tip: With eggs, it’s safe to assume that if you’re within 30 days of the 3-digit code, the eggs are still safe to consume. You can also test an egg’s freshness by putting it in a bowl of cold water. If it sinks, it’s fresh. If it stands up on end, it’s bad.[12]

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Expert Q&A

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  • Question Are expiry dates strict? Marrow Private Chefs Marrow Private Chefs Culinary Experts Marrow Private Chefs are based in Santa Rosa Beach, Florida. It is a chefs’ collective comprised of an ever-growing number of chefs and culinary professionals. Though regionally influenced primarily by coastal, traditional southern, cajun, and creole styles and flavors, the chefs at Marrow have a solid background in all types of cuisine with over 75 years of combined cooking experience. Marrow Private Chefs Marrow Private Chefs Culinary Experts Expert Answer Grocers and manufacturers would tell you that they're absolute, because they want you to throw them out and buy new stuff from them. In reality, many items are still perfectly edible well past their expiration date. If a food product is bad, you are most likely going to be able to tell from sight or smell. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 22 Helpful 29
  • Question My bag of chips says Best By 23/Sep/20. Does this mean September 23, 2020 or September 20, 2023? Josh Schiller Josh Schiller Community Answer It means September 23, 2020––it is following dd/mm/yyyy format. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 101 Helpful 167
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Video

Tips

  • Infant formula is the only product regulated by the FDA with literal “use by” dates. If the date on the formula has passed, toss it out.[13] Thanks Helpful 2 Not Helpful 0
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Warnings

  • Even if an item should still technically be good according to its expiration date, always use your senses to check an item. If something smells or looks bad, it’s safer to discard of it rather than to use it.[14] Thanks Helpful 0 Not Helpful 0
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References

  1. ↑ https://www.heart.org/en/healthy-living/healthy-eating/cooking-skills/storing/understanding-expiration-dates-how-do-i-know-when-my-foods-gone-bad
  2. ↑ https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/food-product-dating
  3. ↑ https://www.nbcphiladelphia.com/news/national-international/whats-the-difference-between-sell-by-best-by-and-use-by-dates-on-food-labels/3383379/
  4. ↑ Marrow Private Chefs. Private Chefs. Expert Interview
  5. ↑ https://www.heart.org/en/healthy-living/healthy-eating/cooking-skills/storing/understanding-expiration-dates-how-do-i-know-when-my-foods-gone-bad
  6. ↑ https://www.nbcphiladelphia.com/news/national-international/whats-the-difference-between-sell-by-best-by-and-use-by-dates-on-food-labels/3383379/
  7. ↑ Marrow Private Chefs. Private Chefs. Expert Interview
  8. ↑ https://ask.usda.gov/s/article/What-is-a-closed-or-coded-date
  9. ↑ https://acmeunitedcorporation.zendesk.com/hc/en-us/articles/227975487-What-is-a-lot-number-and-how-do-I-identify-it
More References (5)
  1. ↑ https://www.foodauthority.nsw.gov.au/food-labelling/stay-safe/date-marking-storage-labelling
  2. ↑ https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/food-product-dating
  3. ↑ https://www.taste.com.au/taste-test-kitchen/articles/egg-freshness-test-cook-not-so-fresh-eggs/zcj0rbxf
  4. ↑ https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/food-product-dating
  5. ↑ https://www.uhhospitals.org/blog/articles/2024/09/is-food-safe-to-eat-after-the-expiration-date

About This Article

Marrow Private Chefs Co-authored by: Marrow Private Chefs Culinary Experts This article was co-authored by Marrow Private Chefs. Marrow Private Chefs are based in Santa Rosa Beach, Florida. It is a chefs’ collective comprised of an ever-growing number of chefs and culinary professionals. Though regionally influenced primarily by coastal, traditional southern, cajun, and creole styles and flavors, the chefs at Marrow have a solid background in all types of cuisine with over 75 years of combined cooking experience. This article has been viewed 1,071,659 times. 189 votes - 31% Co-authors: 12 Updated: October 24, 2025 Views: 1,071,659 Categories: Featured Articles | Food and Grocery Shopping In other languages Dutch Spanish German French Hindi Arabic Korean Indonesian Vietnamese Czech Japanese
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Marrow Private Chefs Co-authored by: Marrow Private Chefs Culinary Experts 189 votes - 31% Click a star to vote 31% of people told us that this article helped them. Co-authors: 12 Updated: October 24, 2025 Views: 1,071,659 Braden

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